EXPERIMENTAL MEASUREMENTS OF TURBULENT HEAT TRANSFER COEFFICIENTS, FRICTION FACTORS AND VELOCITY PROFILES FOR AIR FLOWING PARALLEL TO CLOSELY SPACED RODS

Technical Report · Tue Sep 13 04:00:00 EDT 1960

OSTI ID:4793650

Palmer, L D; Swanson, L L

Heat transfer and fluid dynamic studies were made with air flowing parallel to the rods of a seven rod cluster. The radial centers of the rods were equally spaced in a triangular array with the ratio of the center-to-center distance divided by the rod diameter of 1.015. Pressure drops, velocity profiles, and average and local (with respect to the peripheral position on the surface of the rods) heat transfer film coefficients were measured under established hydrodynamic conditions. The measured average heat transfer film coefficients were found to be approximately equal to those for smooth round ducts, and the peripheral variation of the local coefficients to be from 0.5 to 1.3 of the average values. The data were taken under the following forced convection conditions; Reynolds number 10000 to 60000; rod heat flux 400 to 1000 Btu/hr ft/; and rod surface temperature l00 to 160 deg F. Fanning friction factors calculated from static pressure-drop measurements made along the length of a dual flow passage were approximately equal to those for smooth round ducts over a Reynolds number range of 3000 to 30000. The velocity structure of the flowing gas was determined at a Reynolds number of 20000. The peripheral variation of the local mean to bulk mean velocity ratios was found to approximate that of the local to average heat transfer coefficient ratios. The agreement of the local and average heat transfer data with the local velocity structure and over-all pressure drop measurements is to be expected from mass, momentum, and heat transfer analyses. (auth)

• Research Organization: General Atomic Div. General Dynamics Corp., San Diego, Calif.
• NSA Number: NSA-16-014876
• OSTI ID: 4793650
• Report Number(s): GAMD-1335
• Country of Publication: United States
• Language: English

Related Subjects

AIR
CONFIGURATION
CONVECTION
DIAGRAMS
DISTRIBUTION
ENGINEERING AND EQUIPMENT
ENVIRONMENT
FLUID FLOW
FLUIDS
FRICTION
GAS FLOW
HEAT TRANSFER
HEATING
HYDRODYNAMICS
MASS
MATHEMATICS
MEASURED VALUES
PIPES
PRESSURE
QUANTITATIVE ANALYSIS
QUANTITY RATIO
REYNOLDS NUMBER
SURFACES
TURBULENCE
VELOCITY